Cable Operator Collection In Excel
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Using Collections in VBAA Collection is an type that contains a set of related objects - in memory.Collection types are very useful because it is easy to add items to it and iterate over the items in the collection for whatever purpose you have in mind.Specialized Collection types are used within Office applications. In MS Access for example a Recordset can be a collection of records in a table, the Forms collection contains all the open Forms.In the below the VBA Collections class is explained. Declare and instantiate a collectionA collection object variable must be created as a 'new' collection unless you are going to assign it to an existing collection. Typically, the code to create a collection looks like this: Dim colPersons As Collection Set colPersons = New Collection Add items to the collectionThe code below shows how you can add items to a collection.
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In our case we added custom class objects (Person) to the collection,but you can add anything, including standard types such as strings, or Office application built-in objects. Dim prsPerson As PersonSet prsPerson = New PersonWith prsPerson. Name = 'John Doe'.Age = 37End WithcolPersons. Add Item:=prsPersonSet prsPerson = New PersonWith prsPerson. Name = 'Pete Doe'.Age = 38End WithWhen you add multiple items, like above, you only have to declare the variable once - you can re-use it with each new object.
Dim prsPerson As PersonTo create multiple objects you will have to instantiate new ones for each. Set prsPerson = New Person Add item to the collection include a keyOptionally you can include a key when adding an item.The key can be used to access an item in the collection instead of using the positional index.This key should be an unique string. You will have to make sure there is an unambiguous way to construct the key,for example in NL we use Postal Code + house number to uniquely identify an address.Adding a dupplicate error results in error 457: This key is already associated with an element of this collection.
Test if item exists in collectionOften you don't want to include the same item twice in the collection. To achieve this, you can loop through the collection to see if it is there.Alternatively, if a key was defined for the collection, you can try to get the item directly. If it does not exist, an error occurs, which you should handle. Dim booItemExistsInCollection As Boolean On Error Resume NextcolPersons. Item 3booItemExistsInCollection = ( Err.Number = 0) Find an item in a collection Find an item in a collection using its keyIf you specified the key argument in the collections.Add, you can later use that key to obtain the item from the collection: Set clsPerson = colPersons.
Cable Operator Collection In Excel Format
Item('Pete Doe') Find an item in a collection by looking at the individual propertiesAn alternative way to pick up the item you require is by looping through the collection and testing one or more properties.Add Exit For if you expect only one item. Alternatively you can process all the items that match the selection criteria. Dim clsPerson As PersonFor Each clsPerson In colPersonsIf clsPerson.Age = 38 ThenDebug. Name Exit For End If Next Delete item from the collection (Remove)To remove an item from the collection use the.Remove method. For the index argument either the number in the collection or - if available- the key may be used. Remove 'Pete Doe'CODE VBA - AGORA Software BV Copyright 1997-2019.